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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '173f60e5f9cc522de79fa99cbaeb2334b2c50bcf70a8fc40379cac2a40f98cab' 
  AND token = 'QxOVSD8sagHpi3gbpPHhXUwxNxr6Nu5qdl8UsH7+E/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}